package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.print.DocFlavor;
import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

/**
 * 订单
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

        /**
     * 订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
     */
    public static final Integer PENDING_PAYMENT = 1;
    public static final Integer TO_BE_CONFIRMED = 2;
    public static final Integer CONFIRMED = 3;
    public static final Integer DELIVERY_IN_PROGRESS = 4;
    public static final Integer COMPLETED = 5;
    public static final Integer CANCELLED = 6;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //异常情况的处理（收货地址为空、购物车为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);

        //查询当前用户的购物车数据
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //构造订单数据
        Orders order = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,order);
        order.setPhone(addressBook.getPhone());
        order.setAddress(addressBook.getDetail());
        order.setConsignee(addressBook.getConsignee());
        order.setNumber(String.valueOf(System.currentTimeMillis()));
        order.setUserId(userId);
        order.setStatus(Orders.PENDING_PAYMENT);
        order.setPayStatus(Orders.UN_PAID);
        order.setOrderTime(LocalDateTime.now());

        //向订单表插入1条数据
        orderMapper.insert(order);

        //订单明细数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(order.getId());
            orderDetailList.add(orderDetail);
        }

        //向明细表插入n条数据
        orderDetailMapper.insertBatch(orderDetailList);

        //清理购物车中的数据
        shoppingCartMapper.clean(userId);

        //封装返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(order.getId())
                .orderNumber(order.getNumber())
                .orderAmount(order.getAmount())
                .orderTime(order.getOrderTime())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }

    /**
     * 用户端订单分页查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);

        //查询所有订单
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);


        List<OrderVO> orderVOList = new ArrayList<>();
        if(page.size()>0 && page!=null){
            //查询每个订单下的订单详细
            page.forEach(orders ->{
                Long id = orders.getId();
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

                //封装每个订单
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetailList);
                orderVOList.add(orderVO);
            });
        }
        //封装返回结果
        return new PageResult(page.getTotal(), orderVOList);
    }

    @Override
    public OrderVO details(Long id) {
        //根据id查询订单信息
        Orders orders = orderMapper.getById(id);

        //根据id查询订单详细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    @Override
    public void userCancelById(Long id) {
//        /**
//         * 订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
//         */
//        public static final Integer PENDING_PAYMENT = 1;
//        public static final Integer TO_BE_CONFIRMED = 2;
//        public static final Integer CONFIRMED = 3;
//        public static final Integer DELIVERY_IN_PROGRESS = 4;
//        public static final Integer COMPLETED = 5;
//        public static final Integer CANCELLED = 6;


        //获取订单状态
        Orders orders = orderMapper.getById(id);
        Integer status = orders.getStatus();

        //如果订单处于待支付和接单状态，可直接取消订单
        if(status==PENDING_PAYMENT || status==TO_BE_CONFIRMED){
            //将订单状态修改为已取消
            orders.setStatus(CANCELLED);
            orders.setCancelReason("用户取消");
            orders.setCancelTime(LocalDateTime.now());
            orderMapper.update(orders);
            //退款
        }

        // 校验订单是否存在
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (orders.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
    }

    @Override
    public void repetition(Long id) {
        //查询原订单中的商品
        List<OrderDetail> list = orderDetailMapper.getByOrderId(id);

        //取得菜品信息
        if(list!=null && list.size()>0){
            list.forEach(orderDetail -> {
                //将商品添加到购物车中
                ShoppingCart shoppingCart = new ShoppingCart();
                BeanUtils.copyProperties(orderDetail, shoppingCart);
                shoppingCart.setCreateTime(LocalDateTime.now());
                shoppingCart.setUserId(BaseContext.getCurrentId());
                shoppingCartMapper.insert(shoppingCart);
            });
        }
    }

    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> pagelist = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();
        pagelist.forEach(orders -> {
            String orderDishes = getname(orders);
            OrderVO orderVO = new OrderVO();
            BeanUtils.copyProperties(orders, orderVO);
            orderVO.setOrderDishes(orderDishes);
            list.add(orderVO);
        });
        return new PageResult(pagelist.getTotal(), list);
    }

    /**
     *     //待接单数量
     *     private Integer toBeConfirmed;
     *
     *     //待派送数量
     *     private Integer confirmed;
     *
     *     //派送中数量
     *     private Integer deliveryInProgress;
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        Integer toBeConfirmed = orderMapper.getBystatus(TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.getBystatus(CONFIRMED);
        Integer deliveryInProgress = orderMapper.getBystatus(DELIVERY_IN_PROGRESS);
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /**
     * 接单
     *
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }

    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        Orders order = orderMapper.getById(ordersRejectionDTO.getId());
        if(order.getStatus()!=TO_BE_CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders o = Orders.builder()
                .status(CANCELLED)
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .id(ordersRejectionDTO.getId())
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(o);
    }
    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());


        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }

    /**
     * 完成订单
     *
     * @param id
     */
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }


    private String getname(Orders orders) {
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        StringBuilder name = new StringBuilder();

        orderDetailList.forEach(orderDetail -> {
            Integer number = orderDetail.getNumber();
            StringBuilder namePart = new StringBuilder();
            if(orderDetail.getDishId()!=null){
                Dish dish = dishMapper.getById(orderDetail.getDishId());
                namePart.append(dish.getName());
            }else{
                Setmeal setmeal = setmealMapper.getById(orderDetail.getSetmealId());
                namePart.append(setmeal.getName());
            }
            name.append(namePart.append("*").append(number).append(";"));
        });
        return name.toString();
    }

}
